ArmA 3 Key

- - ArmA 3 - -
My account got global ban.
My Steam is 100% A-Ok
I need a new key, I am ready to buy one from a trusted source.
I will need a walkabout how to install it, making sure I don't blew it, although for what I have seen it looks rather simple...
Thank you!

I KNOW SOMETHING IF YOU DO IT YOU WELL GET NEW KEY PM ME